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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31c1defa7a5b31afe33942f30b234a0423eab00d005f2a0e4033459efdb89b20' 
  AND token = 'H65Ute87HkiamdzJ8SgOe335koOpYQkMBVoEa2FWjV0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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