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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34402e18d6d4929af1b455f84aa05bb7415f9d1e0014d3cfbd5f36bc0b2a5675' 
  AND token = 'y5zgbaYks+4J26PyIWIcEdCqGPUiu00U8rnyaqwOtoA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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