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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c78b2bca120051a606baddc860bb3f86d23652c2efa8c29d2b39e6c015521aa' 
  AND token = 'nGb9HFIpwyAN5XTS/SLxoHY7ZTPJFBWdk6V5WIk1l6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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