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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19a7334888153223d05179d3cd970c8c3ed7232488e1fa6897ac85e17b14ad45' 
  AND token = 'HCoOQTgxoQV9Ut02PhpNK5Ab7aWxsrIs4s4+chqHFYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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