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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a8c7aa82cac598d03159fcee4f9f67e8ae22f60d4ae3a91d76aab2db53cb8e4' 
  AND token = 'zyq/FU2Xn1MRKvczcmI9sp2G5TOMfTX5z+4qcx4l90Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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