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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1844f4ac6adbc77aa4f3cd60bd69e4bba8d300f41388acfde8ad2f8d1fc89c93' 
  AND token = 'OORp9kG+DpDB+0K8nAONV/4Jer8miUqNgMlTuP+Mm80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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