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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbaac01862d11e027ea0c18b1f2c7ae3d28c347c0807c74efb103422efde5ed3' 
  AND token = 'Bc0sKyPiv51Wc1u20MdZ/3MQG7TChBZ9WOC46CAYPSw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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