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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fada6ac26524bb955cc3a4c06894573db79b3524beab4867e1cdd5052256190' 
  AND token = 'auN0EpL2fnLssSGf1a8XnNMhiAzTNY33Wc2goLRXlPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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