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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa60aabf60beed2bcdb7545e7fbb12f4dea0cb5b685d2319e917898580d8fd5b' 
  AND token = 'LOCd7I/9vxqOBxzB2Yy5ZVLG9GsANmliBpM4/FrmlWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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