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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12b869d8a3ac13e5f576af76803ea48e7eeaead9b670665ac01df84d28e4e676' 
  AND token = 'S+88/HZ9MMy9xD08q8Mftu110HnfldUOqfM9YdfxY4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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