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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fa8e067a9c6a720699acf80d7e31efb4fb22c1b80e7a18a3cbadbedf22419bf' 
  AND token = '76isJegrGNEWfYNPxDGtNnXD0HeuUTsRmNxN+tagtFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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