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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf54011982d736824a70b7909f6a488339cf5fe8291e2b75f4adc160ab064c69' 
  AND token = 'P1Tp2omTTzK6YiVNeCZDCC0yE+I1aj97p41cT/PN4qc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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