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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f84d2496f4d1f01efb79d2faff7824f19a2b8bd36f85aae1aa559fa4d8d7f5f' 
  AND token = 'mAPAE7b6lP/pKijUuU1cYKOLJg0OnfBPf+rGMMC9LxE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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