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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87af509a0c5a8928d515d7c0f49111d204a2aed2202f3d185ad3fafb7e248d56' 
  AND token = 'ln0EUft0swnSa70SWK6jGOquL5lFntHO5/YjVOSyPk8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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