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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0eeeb831e2422ab1ea7f4ef358cf1617a383b8c8b2a7d5a3536cde1cd9e6cb32' 
  AND token = 'QSoTa+wbxAmP0esIXU+z6lve9S5by5c2jJDKhYnpElY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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