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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '323b841f61f7307e3e49131b6b78b0e087063ae5ffb4bb373dc9015d7a31bc6b' 
  AND token = '7vNrOxDX9GusLTsqOVV92vUKCUlUg1qM6YP69U0/yhw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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