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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b802d2b3aca36065e68f28b6e066e71fee7f0ba28cbd761e16910950a285933' 
  AND token = 'bHQrpSWQln19v6N0Bze4Nylb7mHMo/IfwCA4ae8plAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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