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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc7f116289c86e623bcb47dfb5bb9a44185bd95fef62eba0521539839f13c3bb' 
  AND token = 'cvOUZai3jPpPTZzfApR/aE6WyLEmgyIrwzUrscWQTX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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