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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c66e6271e45e74fe6df664be5de852e53c1a54f31e821d3ae7c8e9ed60e415d' 
  AND token = 'LeBqJSq21VqdEHlRsupkiumtR1Oj3nWf01jI3A4Wqrk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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