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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c28f0fdcca85f395e9750a736c40d8050083df836c901df1e5c6821c82a5e15' 
  AND token = 'o4xjyMTangbKYGhhwSjIwwsWC7dL73RjyNwOVDUyNjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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