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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7262d7045cb7035089089f7ff823198a3189ef72316c1de353703ee7f399c6c' 
  AND token = 'gwM6zBNHLTK3fUgL22ggYHDo4iJcCE0T8tslfL+fyfE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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