SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '100abd549749456dc6adffaeba6363ae7e57214e7fc86aef8524bb3a688d9e84' 
  AND token = '58QrnyqrTMzbvxvVwYUn9/3gARMcB2U/HHbll+w/0fM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00100

JSON explain

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