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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a19ce5e711eec4666400d377386dd21a50d1ca84ee7499a453d242d9dc713d6d' 
  AND token = '+HIeoIbG5Yl3pevSgcyo4hLnH0dIQms6xGrhbjtRW2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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