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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6e52167fe3b53733b2fd24a82da0bb5f0cd70100c1d3ca556afe48bc2edbbb2' 
  AND token = 'eb0xOdvDj+UdT7KPseNx5wCj9xh8JRIFUPNqg0dJi9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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