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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb613c730679b84b1d071b2ad1a487201971f79d7a8e7ecf3ff151d0d355a9e9' 
  AND token = 'D7/x0cAWmeoLSEhdV7cJQrGuXp2kLrEgN4Gs+ZrSEeE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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