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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84b8b5d618700a141f10962e95f87cacdd6afa69b99eae943f0d00db1a2e6d74' 
  AND token = 'kGdifu27xcliR2aVx6NH7C47785/ETtxrw512fNSyN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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