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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44138180652059073e1012f64f6449a18852de759faf5966af1818aaf96bfaa1' 
  AND token = 'YpYqA5thc9dOFlQgtoC7bDQkVpdsTxDfd5Z1Rat4tTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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