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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b569f80cb3856d9a4767e495cd831c81a6f0fb83f974de9c10a2d3ae5ee7935a' 
  AND token = 'mZ8xaNHOgalejfG+JVGefoEofsc35D0w2JcQdelqLSA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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