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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa8b88df4c2937b267e8d2ae7b66a9ca5e7e2d3fed4561d5cfb69ea060cc435e' 
  AND token = 'sMgTkdw43RFXB4W3xn19gdKmi06DUCKn8SD7E7vjhnc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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