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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd35e06710102d1fbdbddbb671c92ffd2c51b025f2cfd49e33a402b87500f24b6' 
  AND token = '2Oxck/IZBAihdQ0BjuywYL1+BFb/rAEBo85oa9lP+7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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