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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a79b8996f2f7e8bd506e191f79b1778f317b70820e2c83b9a927f1966e15a91' 
  AND token = 'BiPfCQUGguSTdasjUAO8MkRn3z7ZSVttZ37ppeKcUOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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