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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd044a1a5996e87c2404b9e3c667e79c7b67020d19c20d4355b51dba7c5b0c9f1' 
  AND token = 'o5UyXxdsPaV9zi/PP0hlopZUAhTCYi9rYu/iH0VSaRQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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