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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e88f599f9a3d395bbf835e4f23ee953d7adbbe9eeff3d4b5f5722ac3f84b3e93' 
  AND token = 'fKKED4rV8cDUogPQLoOwEFQzLTHZK3OvSZUt2m7LK3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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