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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43ec674e951dbe6fbe1345b1fe8af8debe6deb069bbdbf79e92fb34cbfabadf3' 
  AND token = 'Vs7rTfefr97/vkCInba4DOH2KfyVYsnpY+LCLBCEnKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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