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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2bdd49fdae54a3b1b42d2b9c9195b92ba87c8805a933faa6e5d835dad4f191c' 
  AND token = 'WvQOy9dWI1p9IY0EOho9ts1d2/thp/knhg0kErEs/bI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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