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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6c1c6de6cec0fc046bff40119e9c08659a53209b872f6167b5398abcc52eaf8' 
  AND token = 'dgeONOciNRJEbUW+wTpL7q/nUwGshG6oh25/o4PDiSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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