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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '914b5e04f490803ec1a58879e9d5b8eb8fe4cc683ecebe151373c1c33fde7778' 
  AND token = '3jSbJxmkjNqpOcYGtCZMpXYtso/cHgD6atfnJxxKacc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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