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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c7bd45f6bc3d9ee19f844ff233eadcaa754b6a035fcba9e65309d95bd89cde4' 
  AND token = '+bDtDl6ywnVwV+UtRxArVJ1f5xBvZ4FP17ZeCH3II8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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