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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a3e02f8a889ddf0bc5481b69418a0d8be3a6d4bdc33d51db912073fc270aa36' 
  AND token = 'aYav8ZKH/8zOy1lywoeNZLMb1LL01frBnrvVJj/dVY8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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