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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18baa092dec22ca558df31e8e375c95da745cb14bcc5ad8aa8bfa26d51df81db' 
  AND token = 'JEyjC/2+lZ1jYCmDQ+vynjdzYEwm2hgfkUTBwpexDaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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