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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed6259b6c25a73a517da030a831f7f084284482cc8f06b82a9aca6e0255966f6' 
  AND token = 'trvjoGI81+ri78xLHxreBa8oDi/xrMclDGHeQKQDRfQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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