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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '282c1f623a6c0d3b353e5b3af93825ed36b97abb3577b7e9371c557634e2ed28' 
  AND token = 'QRq/duyD1fGq4MbubLOutwZORvTqaeWHkz3gF9rrYsY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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