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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbbe5be17fdddb0339872270cbab3ece33ffb98755cc75a4680dbe19473b29e3' 
  AND token = 'b7AIfrvg5a17I1rqrxNHjbqRncdXFZ5yXjfY+g+5mJI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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