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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb2c816b6726b489a906ce4f6636bea03a8f2e5b72cb6b99b3ef622908fddeb5' 
  AND token = 'Km9WtJHG+Jp6BCh6tt/e77QzfJwBzMXt1gB/w5TXMsc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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