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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13cf3df31e15f531b97176feb8da0327f2472708b814b57effec524d268683d2' 
  AND token = '50/jzrxYlc2o171pBa/nWK3L3IMccEHj6S+rPaYk3Gg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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