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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca1a9e9c77c8bbd4c1c91ffa918246f443844c4f0d47671f946902262e683131' 
  AND token = 'Iiobsb4rOGOMW7A4z0o8zTp8i3Y0MPUtEYrnphA7aow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}