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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8619956518f31040fd4c986461672ffad9dc6059b872e56a207c9f4e0f9c260' 
  AND token = 'nNKJme3jbH76+iLq47NandJQ8QQZk+D+5yI3PnFIqJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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