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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a90c0d3987bf5092791bdf9653f9842e381afd69c1a570de4d7fe52774cd61e' 
  AND token = 'wwNn4QswRfl7S0yCjpD/l6oaZQtTCE9aHGx4gZKILmU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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