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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc03ff081710ccf0044b1d0c25eb587e7aacb7b491f168f5cb00afc47b9736aa' 
  AND token = 'ACzsPzhokBCL4mRv29iCgp6bL8U3HoEmvial/O7G8Vc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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