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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '154bdb506c6ac7fd09c72ad5228cdab9236f754b4c5c6f9f363ceb11818acb17' 
  AND token = '9JTYR+o3XJK3i73pRtRO8p+FENFS0hjojIEX1P7Iz+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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