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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47f793e11c0b8bbe3166e9ddf24f6c0490fda279b3799b2f71161c32e3a57115' 
  AND token = 'hy2g7Z5rQozWd1dJLwnVbf0dth3TJ/D3t7+S3VfFQEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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