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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6c30e8d75d5c114420f31fb7c2f3e511b31e2c8bb44b0f8adb1502df30504c6' 
  AND token = 'pJ/281WS5qQgNyh4V0FaUpy9jwV+xFxycp7+5uYt9Gs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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