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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf56cf00d4dbd7b9f4b334e41136001a58bdf5bbc35567d0c382ae86a4352988' 
  AND token = 'NgyDFn7QJQ7ZKtaS4zKszYSW7ACpMJXM1xsbt0V7Nb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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