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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '809243d07d3d220c79a80d7511a487b37ce1d27fda097bd8e990e23496b952f3' 
  AND token = 'a/xX1oYX3X9wpkYK+9CljpbSu4s9+c9wzVft7JzKTrU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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