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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b325fbf7ea433bb5ab9bd8ce6c9ee0d565e9ad5d2a5c2947b8a07e443d73f9c' 
  AND token = 'ajY8inb5ftlpKCJ6SUpyQiom5X9Gi0qXFmoFF7Qhntk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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