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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9d4b6da6feb5d4ff93af8826ea0d6adfab216afca6a9739f0c14ee15355ca71' 
  AND token = 'dhX7z1ZR/dxVvEFsIqlmOotFPn7oGSIcdon/ZpJ0wiw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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